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Professional Window Replacement Services Available to Homeowners Throughout Long Island, NY 

Do you feel frustrated by the condition of your house windows? Is it because they are functioning poorly or detracting from the curb appeal of your residence? If that is the case, now is the time to turn Thermo-Seal Windows & Siding. Since 1985, our skilled and experienced team has proudly provided first-rate window replacement services for homeowners throughout the Long Island, New York, area. We have a long list of satisfied customers, and we look forward to showing you why.

What to Expect During a Window Replacement in Long Island

At Thermo-Seal Windows & Siding, we offer our own line of custom windows. These windows are manufactured by our partner, Harvey Building Products. Additionally, we install top-quality replacement windows that are sourced from Andersen and Pella—both companies are known for crafting durable and attractive products.

What’s more, we are an Andersen Certified Contractor, ensuring we have the expertise needed to install these windows correctly the first time.  

When you partner with us for your window replacement, you can expect our team to install replacement windows that are:

  • Available in various materials, including wood, thermoplastic, composite, and vinyl 
  • Crafted in popular styles, such as slider, garden, casement, picture, bay, bow, double-hung, and completely custom window styles and shapes 
  • Energy efficient, which means they can help reduce your heating and cooling expenses by up to one-third 
  • Easy to care for and require minimal maintenance  
  • Able to help reduce the infiltration of outdoor noise 

Our replacement windows are also backed by a 100% satisfaction guarantee and a limited lifetime warranty which covers defects or seal failures on all mechanical and vinyl components.

Contact Your Local Window Replacement Experts Today 

For more information about our window replacement services, contact Thermo-Seal Windows & Siding today. We look forward to outfitting your Long Island, NY, home with best-in-class windows you’ll love.

We make clients happy.

We Make it Easy

With customer service and craftsmanship that’s second-to-none, we make it easy
to achieve the home of your dreams.
Free, No Hassle Estimates Schedule a free in-home or virtual estimate. We’re here to help!
High Quality Products We offer the best products available, including our own brand of replacement windows.
Satisfaction Guarantee Our job is not done until you’re completely satisfied.

We've got connections.

We're certified by the industry’s leading manufacturers to offer a wide range of top quality options. View Our Credentials

Thermo-Seal Windows Siding & Roofing, Inc. is an A+ Rated BBB Accredited Business serving Westchester County, Rockland County, Nassau County, Suffolk County and Fairfield County. We offer multiple locations throughout the Tri-State Area to better serve our customers.

456 Sunrise Highway
Rockville Center, NY 11570
(866) 281-4567
Melville Office
68 South Service Road
Melville, NY 11747
(866) 281-4567
Rye Corporate Office
411 Theodore Fremd Avenue
Rye, NY 10580
(914) 925-3443
Stamford Office
263 Tresser Blvd
Stamford, CT 06901
(203) 663-3534